Pencil box calculator



FIG. 1 is a isometric view of a pencil box calculator;

FIG. 2 is a back view of the pencil box calculator shown in FIG. 1;

FIG. 3 is a left end view of the pencil box calculator shown in FIG. 2; and,

FIG. 4 is a right end view of the pencil box calculator shown in FIG. 2. 

The ornamental design for a pencil box calculator, as shown. 